The normal bandwidth for FT8 is 2.5 to 2.8 kc. at 1.842.9 you should
have been outside the FT8 band. Hardly anyone operates above 2.5 it
seems anyway. I think you were essentially being trolled. I suppose
you could have been pretty wide for a local or close in station wiping
out a fair portion of the upper end of the band.
I am usually on 160 FT8 every night but I took the weekend off for the
contest from FT8.
Too bad the guy did not identify. I noticed a few freq cops on the
cluster announcements where some FT8 users think they deserve clear
space which we know does not exist is a shared band that we have.
W0MU
On 11/27/2017 2:17 PM, Tim Shoppa wrote:
As a practical matter there are several 2 kHZ segments of each band that are now
devoted to 24x7 JT65, FT8, and other digital modes. Weak signal CW work - eg working
rare mults or even just weak guys from common mults - in those segments just
isn’t gonna happen.
Substantial parts of 80M and 40M have been pretty bad for several years now
with SAILNET and other automatic modes.
Tim N3QE
On Nov 27, 2017, at 3:43 PM, Roger Parsons via Topband <topband@contesting.com>
wrote:
As we all know, CQWW produces huge activity on all HF bands. This year I was
hearing stations up to well above 1850kHz. I have found that trying to run
Europe is often more productive in the 1840-1850 segment, presumably because it
is less crowded than lower in frequency.
Late in the contest I started to CQ on about 1842kHz, and after a while, and several
QSOs, was told (on CW): "Please QSY. 1840 is reserved for FT8. Good luck in the
contest." Ignoring the fact that nobody has a reserved frequency on any band, I
thought OK, don't want to upset anybody, and moved to 1842.9kHz. Shortly, the same
message arrived.
My (probably incorrect) understanding is that FT8 stations are using USB with a
carrier frequency of 1840kHz. So a CW station on 1842.9 should be out of their
passband. I did listen carefully and could not hear any FT8 transmissions above
1842.2. (I have multiple receive antennas in a very quiet location.)
I believe that FT8 transmissions in principle use a microscopic bandwidth, but
it appears they actually need a wide clear channel.
Yes? No?
73 Roger
VE3ZI
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